Programming Tutorials

  The Trap: Signal-Only Dogmatism The introduction of Signals in Angular led to a predictable over-correction: developers are attempting to purge RxJS entirely from their codebases. The friction point is almost always asynchronous data fetching based on user input (e.g., search type-aheads, dependent dropdowns, or paginated lists). In the RxJS era,  switchMap  was the definitive solution for handling race conditions. It automatically cancelled pending requests when new emissions occurred. When developers attempt to port this logic purely to Signals using  computed  or  effect , they encounter a critical architectural wall. A  computed  signal cannot be asynchronous, and an  effect  should rarely write to other signals. Consequently, we see code like this entering production: // ❌ ANTI-PATTERN: The "Manual SwitchMap" effect(async (onCleanup) => { const query = this.searchQuery(); let active = true; onCleanup(() => { active = ...